Why Ants Enter Your Home (and How to Make Them Leave)

Ant colonies work through pheromone communication. A scout leaves the colony, wanders semi-randomly, and if it finds food, walks back to the colony leaving a chemical trail. Other workers follow the trail, reinforce it with their own pheromone, and within an hour hundreds of ants are moving along a single line.

This is why the trail feels so relentless. When you wipe the counter, you remove the pheromone from the counter surface — but the pheromone in the crack in the wall, in the tile grout, on the back of the counter, is untouched. New scouts follow it back to the food source, and the trail reforms.

Ants want three things: sugar, protein and water. Different species prefer different targets. Small brown 'sugar ants' target open packets of sugar, dropped biscuit crumbs, honey and sweet spills. Larger black ants often want protein — leftover meat scraps, pet food, dead insects. All ants also seek water, especially during summer.

Monsoon is the other big driver. When soil floods, entire ant colonies relocate to drier ground — usually inside your compound wall, under the kitchen slab, or in the gap between a false ceiling and the real ceiling. This is why new ant trails often appear in June and July even if you never had ants before.

Household sprays kill worker ants on contact. But those workers were on their way back to the colony with food — killing them means the queen never gets the food, so the colony sends more workers. Worse, some sprays trigger a colony 'bud' response, where the queen splits the colony into multiple smaller colonies to survive the threat. This is why homes that spray heavily often end up with more ant trails, not fewer.

The strategy is to let the workers do the work. A slow-acting bait — either a homemade borax-and-sugar mix (1 part borax to 3 parts sugar, dissolved in a little water and placed in a jar lid on the trail) or a professional ant gel — is picked up by workers, carried back to the colony, and shared with the queen and other workers. Within 3–7 days, the entire colony is eliminated.

Do not wipe the trail while the bait is being taken. Let the workers continue to walk to the bait. This feels counter-intuitive, but wiping the trail interrupts the bait uptake and delays elimination.

If you see large black ants (over 8mm) coming out of wooden furniture, especially with small piles of sawdust below the emergence point, you have carpenter ants. Unlike sugar ants, carpenter ants excavate wood for their nests — damaging wooden furniture over time. Carpenter ants require professional treatment; retail baits are usually not enough.

Call us for: multiple simultaneous ant trails in different rooms, ant trails that reform within a day of DIY baiting, any suspected carpenter ants in wooden furniture, or any ant colony you can locate inside a wall cavity.

Ant trails are pheromone-driven, and pheromone lives in cracks that wiping cannot reach. Sprays kill workers but leave the colony, and sometimes cause the colony to split. Slow-acting bait carried back to the queen is what actually eliminates the colony. Seal entry points, store sugars airtight, and fix leaks to prevent re-entry. Carpenter ants in wood are a separate problem that needs professional treatment.